@@ -52,6 +52,9 @@ typedef struct GIFDemuxContext {

     int total_iter;

     int iter_count;

     int ignore_loop;

+

+    int nb_frames;

+    int last_duration;

 } GIFDemuxContext;

 /**

@@ -279,6 +282,9 @@ parse_keyframe:

             pkt->stream_index = 0;

             pkt->duration = gdc->delay;

+            gdc->nb_frames ++;

+            gdc->last_duration = pkt->duration;

+

             /* Graphic Control Extension's scope is single frame.

              * Remove its influence. */

             gdc->delay = gdc->default_delay;

@@ -299,6 +305,9 @@ resync:

     }

     if ((ret >= 0 && !frame_parsed) || ret == AVERROR_EOF) {

+        if (gdc->nb_frames == 1) {

+            s->streams[0]->r_frame_rate = (AVRational) {100, gdc->last_duration};

+        }

         /* This might happen when there is no image block

          * between extension blocks and GIF_TRAILER or EOF */

         if (!gdc->ignore_loop && (block_label == GIF_TRAILER || avio_feof(pb))